/* Copyright (c) 2001-2009, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.lib;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
* Creates a direct, compressed or decompressed copy of a file.
*
* @author Blaine Simpson (blaine dot simpson at admc dot com)
* @version 1.9.0
* @since 1.9.0
*/
public class FileArchiver {
public static final int COMPRESSION_NONE = 0;
public static final int COMPRESSION_ZIP = 1;
public static final int COMPRESSION_GZIP = 2;
private static final int COPY_BLOCK_SIZE = 1 << 16;
/*
public static void compressFile(String infilename, String outfilename,
FileAccess storage) throws IOException {
FileArchiver.archive(infilename, outfilename, storage, COMPRESSION_ZIP);
}
public static void decompressFile(String infilename, String outfilename,
FileAccess storage) throws IOException {
FileArchiver.unarchive(
infilename, outfilename, storage, COMPRESSION_ZIP);
}
public static void copyFile(String infilename, String outfilename,
FileAccess storage) throws IOException {
FileArchiver.archive(
infilename, outfilename, storage, COMPRESSION_NONE);
}
public static void restoreFile(String infilename, String outfilename,
FileAccess storage) throws IOException {
FileArchiver.unarchive(
infilename, outfilename, storage, COMPRESSION_NONE);
}
*/
public static void archive(String infilename, String outfilename,
FileAccess storage,
int compressionType) throws IOException {
InputStream in = null;
OutputStream f = null;
DeflaterOutputStream deflater = null;
boolean completed = false;
// if there is no file
if (!storage.isStreamElement(infilename)) {
return;
}
try {
byte[] b = new byte[COPY_BLOCK_SIZE];
in = storage.openInputStreamElement(infilename);
f = storage.openOutputStreamElement(outfilename);
switch (compressionType) {
case COMPRESSION_ZIP :
f = deflater = new DeflaterOutputStream(f,
new Deflater(Deflater.BEST_SPEED), b.length);
break;
case COMPRESSION_GZIP :
f = deflater = new GZIPOutputStream(f, b.length);
break;
case COMPRESSION_NONE :
break;
default :
throw new RuntimeException("FileArchiver"
+ compressionType);
}
while (true) {
int l = in.read(b, 0, b.length);
if (l == -1) {
break;
}
f.write(b, 0, l);
}
completed = true;
} catch (Throwable e) {
throw FileUtil.toIOException(e);
} finally {
try {
if (in != null) {
in.close();
}
if (f != null) {
if (deflater != null) {
deflater.finish();
}
f.close();
}
if (!completed && storage.isStreamElement(outfilename)) {
storage.removeElement(outfilename);
}
} catch (Throwable e) {
throw FileUtil.toIOException(e);
}
}
}
public static void unarchive(String infilename, String outfilename,
FileAccess storage,
int compressionType) throws IOException {
InputStream f = null;
OutputStream outstream = null;
boolean completed = false;
try {
if (!storage.isStreamElement(infilename)) {
return;
}
storage.removeElement(outfilename);
byte[] b = new byte[COPY_BLOCK_SIZE];
f = storage.openInputStreamElement(infilename);
switch (compressionType) {
case COMPRESSION_ZIP :
f = new InflaterInputStream(f, new Inflater());
break;
case COMPRESSION_GZIP :
f = new GZIPInputStream(f, b.length);
break;
case COMPRESSION_NONE :
break;
default :
throw new RuntimeException("FileArchiver: "
+ compressionType);
}
outstream = storage.openOutputStreamElement(outfilename);
while (true) {
int l = f.read(b, 0, b.length);
if (l == -1) {
break;
}
outstream.write(b, 0, l);
}
completed = true;
} catch (Throwable e) {
throw FileUtil.toIOException(e);
} finally {
try {
if (f != null) {
f.close();
}
if (outstream != null) {
outstream.flush();
outstream.close();
}
if (!completed && storage.isStreamElement(outfilename)) {
storage.removeElement(outfilename);
}
} catch (Throwable e) {
throw FileUtil.toIOException(e);
}
}
}
}